If your filter has become too dirty from lack of service, or if it had become damaged somehow, then no need to worry as you can purchase a replacement filter. This is the COBB Tuning Replacement Filter that originally came in the SF Intake System and it is available for your convenience so that you don't have to resort to getting an entirely new intake.
This is a cotton filter that will come in a blue finish and is serviceable so during your normal maintenance routines you can clean and re-oil the filter for future use.